Well Gary..

Actually Boxer type fractures of the 4th or 5th metacarpals are often an imbrication or telescoping fracture but not exclusively. These fractures usually occur when a person hooks with the palm down and clips the knuckle.. These fractures may occour with or without gloves.

The question we are addressing here is complex. There are no simple answers. I turn over punches for the most part with or without gloves. That is me. Here is a video of Chris Goetz. I studied with him and he is a high level kenpo rank and also a champion boxer that now trains other fighters. You might enjoy studying his tapes..Here is one, Chris really helped me emmensly many years ago... He has a school in San Diego I think..